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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Aerodynamic Jump and Ballistic Solutions
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<blockquote data-quote="FrankPetersenDK" data-source="post: 865151" data-attributes="member: 45071"><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">BrentM.</span></span></p><p><strong><span style="font-size: 12px"><span style="font-family: 'Calibri'">Subject: Angled wind.</span></span></strong></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">Theoretically, you are able to account for angled wind, if and only if, the scientific assumptions for the calculations are present at your location (which they never are). However, I still find it a good exercise to calculate theoretical wind deflection for angled wind, as it helps me understand the dynamics of the subject matter, when I am in the field. Wind doping skills and experience prevail over pure science competencies in this matter, as wind is so very non-deterministic.</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">In a three dimensional world all winds can be divided into three sub components:</span></span></p><p><span style="font-family: 'Calibri'"><span style="font-family: 'Calibri'"><span style="font-size: 12px">1.</span></span> </span><span style="font-size: 12px"><span style="font-family: 'Calibri'">Horizontal wind component (left or right)</span></span></p><p><span style="font-family: 'Calibri'"><span style="font-family: 'Calibri'"><span style="font-size: 12px">2.</span></span> </span><span style="font-size: 12px"><span style="font-family: 'Calibri'">Vertical wind component (up or down)</span></span></p><p><span style="font-family: 'Calibri'"><span style="font-family: 'Calibri'"><span style="font-size: 12px">3.</span></span> </span><span style="font-size: 12px"><span style="font-family: 'Calibri'">Trajectory directional component (towards the shooter or away from the shooter)</span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">Remember that only the crosswind of horizontal and vertical winds effects the deflection. The illustration below show the calculation of cross wind power and the factor used.</span></span></p><p><strong><span style="font-size: 12px"><span style="font-family: 'Calibri'">See Attachment. </span></span></strong></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">From the illustration, you can see that a horizontal wind consists of a crosswind power (green -perpendicular to the line of sight) and a trajectory directional component (blue). </span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">An angled wind will consist of a (perpendicular to the line of sight - up or down) vertical crosswind and a horizontal wind. In other words, you have both a horizontal and vertical deflection, when you encounter an angled wind up the hillside. We are only interested in the crosswind components for calculating wind deflection because it is calculated as follows (Bryan Litz):</span></span></p><div style="text-align: center"><div style="text-align: center"><strong><span style="font-size: 12px"><span style="font-family: 'Calibri'">Wind Deflection = crosswind power x lag time</span></span></strong></div> </div><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">In US imperial numbers the formula looks like this:<strong> See Attachment.</strong></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">I hope you can read my native tongue – the abbreviations are almost the same as used above. </span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">You are, of course, able to use excel and calculate the exact deflection by hand for angled wind, but I find it much easier to use Sierra Bullet Infinity Suite software, which include an entre for vertical wind. </span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">In addition, if you are really hooked on wind, you can theoretically calculate total horizontal wind deflection for horizontal winds that prevail <strong>in intervals</strong> along the line of sight. I do not find it worth the effort. Again, this feature is included in the Sierra Suite. </span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Calibri'">In conclusion, I am of the opinion, that only experience and common sense will insure a clean kill under difficult mountain hunting conditions. If angled winds are very strong, the only solution may be to get closer to your prey to insure a clean kill.</span></span></p></blockquote><p></p>
[QUOTE="FrankPetersenDK, post: 865151, member: 45071"] [SIZE=3][FONT=Calibri]BrentM.[/FONT][/SIZE] [B][SIZE=3][FONT=Calibri]Subject: Angled wind.[/FONT][/SIZE][/B] [SIZE=3][FONT=Calibri]Theoretically, you are able to account for angled wind, if and only if, the scientific assumptions for the calculations are present at your location (which they never are). However, I still find it a good exercise to calculate theoretical wind deflection for angled wind, as it helps me understand the dynamics of the subject matter, when I am in the field. Wind doping skills and experience prevail over pure science competencies in this matter, as wind is so very non-deterministic.[/FONT][/SIZE] [SIZE=3][FONT=Calibri]In a three dimensional world all winds can be divided into three sub components:[/FONT][/SIZE] [FONT=Calibri][FONT=Calibri][SIZE=3]1.[/SIZE][/FONT] [/FONT][SIZE=3][FONT=Calibri]Horizontal wind component (left or right)[/FONT][/SIZE] [FONT=Calibri][FONT=Calibri][SIZE=3]2.[/SIZE][/FONT] [/FONT][SIZE=3][FONT=Calibri]Vertical wind component (up or down)[/FONT][/SIZE] [FONT=Calibri][FONT=Calibri][SIZE=3]3.[/SIZE][/FONT] [/FONT][SIZE=3][FONT=Calibri]Trajectory directional component (towards the shooter or away from the shooter)[/FONT][/SIZE] [SIZE=3][FONT=Calibri]Remember that only the crosswind of horizontal and vertical winds effects the deflection. The illustration below show the calculation of cross wind power and the factor used.[/FONT][/SIZE] [B][SIZE=3][FONT=Calibri]See Attachment. [/FONT][/SIZE][/B] [SIZE=3][FONT=Calibri]From the illustration, you can see that a horizontal wind consists of a crosswind power (green -perpendicular to the line of sight) and a trajectory directional component (blue). [/FONT][/SIZE] [SIZE=3][FONT=Calibri]An angled wind will consist of a (perpendicular to the line of sight - up or down) vertical crosswind and a horizontal wind. In other words, you have both a horizontal and vertical deflection, when you encounter an angled wind up the hillside. We are only interested in the crosswind components for calculating wind deflection because it is calculated as follows (Bryan Litz):[/FONT][/SIZE] [CENTER][CENTER][B][SIZE=3][FONT=Calibri]Wind Deflection = crosswind power x lag time[/FONT][/SIZE][/B][/CENTER][/CENTER] [SIZE=3][FONT=Calibri]In US imperial numbers the formula looks like this:[B] See Attachment.[/B][/FONT][/SIZE] [SIZE=3][FONT=Calibri]I hope you can read my native tongue – the abbreviations are almost the same as used above. [/FONT][/SIZE] [SIZE=3][FONT=Calibri]You are, of course, able to use excel and calculate the exact deflection by hand for angled wind, but I find it much easier to use Sierra Bullet Infinity Suite software, which include an entre for vertical wind. [/FONT][/SIZE] [SIZE=3][FONT=Calibri]In addition, if you are really hooked on wind, you can theoretically calculate total horizontal wind deflection for horizontal winds that prevail [B]in intervals[/B] along the line of sight. I do not find it worth the effort. Again, this feature is included in the Sierra Suite. [/FONT][/SIZE] [SIZE=3][FONT=Calibri]In conclusion, I am of the opinion, that only experience and common sense will insure a clean kill under difficult mountain hunting conditions. If angled winds are very strong, the only solution may be to get closer to your prey to insure a clean kill.[/FONT][/SIZE] [/QUOTE]
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